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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>5.8.流程控制-循环结构-双重for循环-练习3</title>
    <script>
        //输出正三角形
        var str = '';
        for (var i = 1; i <= 10; i++) { // 外层循环控制行数
            for (var j = 1; j <= i; j++) {  // 里层循环 列数小于行数 j<=i
                str = str + '☆';
            }
            str += '\n';
        }
        console.log(str);
    </script>
</head>

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</body>

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